NX2116B datasheet(10/14 Pages) MICROSEMI

Part #	NX2116B

Description	SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT, POWER GOOD & OVER VOLTAGE

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Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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10 / 14 page

NX2116/2116A/2116B/2117/2117A

10

Rev. 3.0

03/14/06

Case 2:

F

LC<FESR<FO

40dB/decade

20dB/decade

loop gain

LC

F

ESR

F

compensator

power stage

FZ1 Z2

F

O

F

FP2

P1

F

Figure 5 - Bode plot of Type III compensator

(F

LC<FESR<FO)

If electrolytic capacitors are used as output

capacitors, typical design example of type III

compensator in which the crossover frequency is

selected as F

LC<FESR<FO and FO<=1/10~1/5Fs is shown

as the following steps. Here two SANYO MV-WG1500

with 13 m

Ω is chosen as output capacitor.

1. Calculate the location of LC double pole F

LC

and ESR zero F

ESR.

LC

OUT

1

F

2

LC

1

2

1uH 3000uF

2.9kHz

=

×π ××

=

×π ××

=

ESR

OUT

1

F

2

ESRC

1

2

6.5m

3000uF

8.2kHz

=

×π ××

=

×π ×

Ω×

=

2. Set R

2 equal to 10kΩ.

×

Ω×

=

=Ω

2

REF

1

OUT

REF

RV

10k

0.8V

R =

8k

V

-V

1.8V-0.8V

Choose R

1=8kΩ.

3. Set zero F

Z2 = FLC and Fp1 =FESR .

4. Calculate C

3 .

3

2

z2

p1

1

11

C =

(-)

2

R

FF

1

11

=

(-)

2

10k

2.9kHz 8.2kHz

=3.5nF

×

×π×

×

×π ×Ω

Choose C

3=3.3nF.

5. Calculate R

3 .

3

P13

1

R

2

FC

1

2

8.2kHz 3.3nF

5.9k

=

×π ××

=

×π ××

=Ω

Choose R

3 =5.9kΩ.

6. Calculate R

4 with FO=60kHz.

OSC

O

23

4

in

23

V2

F

L

RR

R=

V

ESR

RR

1.5V

2

60kHz 1uH 10k

5.9k

=

12V

6.5m

10k

5.9k

=26.9k

×π × ××

××

+

×π ×

×

Ω ×Ω

××

Ω

Ω +Ω

Ω

Choose R

4=26.7kΩ.

5. Calculate C

2 with zero Fz1 at 75% of the LC

double pole by equation (11).

2

Z14

1

C

2

FR

1

2

0.75 2.9kHz 26.7k

2nF

=

×π ××

=

×π ×

×

×Ω

=

Choose C

2=2.2nF.

6. Calculate C

1 by equation (14) with pole Fp2 at

half the switching frequency.

1

4

P2

1

C

2

RF

1

2

26.7k

300kHz

20pF

=

×π ××

=

×π ×

Ω×

=

Choose C

1=22pF.

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